TAILIEUCHUNG - Photoshop 6 for Windows Bible- P19

Photoshop 6 for Windows Bible- P19:If you are reading this foreword, it probably means that you’ve purchased a copy of Adobe Photoshop , and for that I and the rest of the Photoshop team at Adobe thank you. If you own a previous edition of the Photoshop Bible, you probably know what to expect. If not, then get ready for an interesting trip. | Chapter 11 Full-Court Filtering 509 Tip Both filters can affect elliptical regions only. If a selection outline is not elliptical X Photoshop applies the filter to the largest ellipse that fits inside the selection. As 1 a result the filter may leave behind a noticeable elliptical boundary between the affected and unaffected portions of the selection. To avoid this effect select the region you want to edit with the elliptical marquee tool and then feather the selection before filtering it. This softens the effect of the filter and provides a more gradual transition even more so than Pinch already affords . One of the more remarkable properties of the Pinch filter is that it lets you turn any image into a conical gradation. Figure 11-15 illustrates how the process works. First blur the image to eliminate any harsh edges between color transitions. Then apply the Pinch filter at full strength 100 percent . Reapply the filter several more times. Each time you press Ctrl F the center portion of the image recedes farther and farther into the distance as shown in Figure 11-15. After 10 repetitions the face in the example all but disappeared. Pinch x 3 Pinch x 5 Pinch x 10 Radial Blur Figure 11-15 After applying the Gaussian Blur filter I pinched the image 10 times and applied the Radial Blur filter to create a conical gradation. Next apply the Radial Blur filter set to Spin 10 pixels or so to mix the color boundaries a bit. The result is a type of gradation that you can t create using Photoshop s gradient tool. 510 Part III Selections Masks and Filters Twirling spirals The Twirl filter rotates the center of a selection while leaving the sides fixed in place. The result is a spiral of colors that looks for all the world as if you poured the image into a blender set to a very slow speed. When you choose Filter Distort Twirl Photoshop displays the Twirl dialog box shown in Figure 11-16. Enter a positive value from 1 to 999 degrees to spiral the image in a clockwise .

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